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Fair Value of Financial Instruments - Schedule of Portfolio Investments by Level in the Fair Value Hierarchy (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | $ 1,729,264 | $ 1,724,243 |  |
Investments, at fair value: | 1,760,030 | 1,754,039 | [1] |
Controlled investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, at fair value: | 91,114 | 91,425 |  | $ 12,472
Controlled investments | CION/EagleTree Partners, LLC |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, at fair value: | 30,766 | 29,796 |  |
Senior secured first lien debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 1,579,512 | 1,526,989 |  |
Senior secured second lien debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 38,769 | 38,583 |  |
Collateralized securities and structured products - equity |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 1,179 | 2,998 |  |
Unsecured debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 22,643 | 26,616 |  |
Equity |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 76,292 | 41,140 |  |
Short term investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 10,869 | 87,917 |  |
Level 1 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 13,210 | 91,321 |  |
Level 1 | Senior secured first lien debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 0 | 0 |  |
Level 1 | Senior secured second lien debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 0 | 0 |  |
Level 1 | Collateralized securities and structured products - equity |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 0 | 0 |  |
Level 1 | Unsecured debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 0 | 0 |  |
Level 1 | Equity |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 2,341 | 3,404 |  |
Level 1 | Short term investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 10,869 | 87,917 |  |
Level 2 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 0 | 0 |  |
Level 2 | Senior secured first lien debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 0 | 0 |  |
Level 2 | Senior secured second lien debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 0 | 0 |  |
Level 2 | Collateralized securities and structured products - equity |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 0 | 0 |  |
Level 2 | Unsecured debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 0 | 0 |  |
Level 2 | Equity |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 0 | 0 |  |
Level 2 | Short term investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 0 | 0 |  |
Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 1,716,054 | 1,632,922 |  |
Investments, at fair value: | 1,716,054 | 1,632,922 |  |
Level 3 | Senior secured first lien debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 1,579,512 | 1,526,989 |  |
Level 3 | Senior secured second lien debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 38,769 | 38,583 |  |
Level 3 | Collateralized securities and structured products - equity |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 1,179 | 2,998 |  |
Level 3 | Unsecured debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 22,643 | 26,616 |  |
Level 3 | Equity |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | 73,951 | 37,736 |  |
Level 3 | Short term investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Investments, fair value disclosure | $ 0 | $ 0 |  |
[1] | Fair value determined in good faith by the Company’s board of directors (see Note 9) using significant unobservable inputs unless otherwise noted.

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- Definition Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5D -Subparagraph (SX 210.12-13D(Column C)) -URI https://asc.fasb.org/extlink&oid=122147990&loc=SL120429264-123010 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column C)) -URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010 + Details
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